The source of ignition for these explosions can be attributed to one of the following:
A leaking air start valve. Whilst the engine is running, the hot gases produced as the fuel burns in the cylinder (at above 1200°C) leak past a valve which has not re-seated correctly. The branch pipe to the air start manifold heats up to red heat. If the engine is stopped and restarted before the pipe has time to cool, any oil vapour in the air can be ignited and an explosion can result if the mixture of oil/air is correct.
Fuel leaking into the cylinder whilst the engine is stopped. When the engine then undergoes a start sequence, and builds up speed, the fuel which has leaked into the cylinder vaporises and the heat from the compression of the air in the cylinder, as the piston rises, ignites the fuel. When the air start valve opens as the piston comes over TDC, the pressure in the cylinder is higher than the air start pressure, and the burning combustion gases pass to the air start manifold, igniting the oil entrained in the air.
A recent theory by ClassNK has concluded that the principal cause of explosions in starting air manifolds of marine engines is probably the auto ignition of oil deposited on the inner surface of the manifold, not backfire from cylinders as previously thought. Auto-ignition conditions occur because of the high temperature generated by the rapid inflow of high-pressure air, says the research. This incoming air compresses air downstream of the main starting valve, causing its temperature to reach as high as 400°C which in some cases causes oil deposits in the manifold to self-ignite leading to an explosion. ClassNK has adapted its safety requirements for a starting system to account for the findings. It now requires the fitting of rupture discs to the manifold on engines with a flame arrester in each branch pipe leading to the cylinders. This is beyond IACS unified requirements, which account for cylinder backfire as the cause of starting air manifold explosions.
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To minimise the risk of explosions, the oil carry over from the compressor should be reduced to a minimum. Class regulations require that the air compressor's air intakes are located in an oil-free atmosphere, and a drain/filter for intercepting oil/water mist is fitted between compressor discharge and air receiver. There must be complete separation of compressor discharge and starting air supply to engines at the receiver which is fitted with a drain and a relief valve.
The air start system must be protected with a non return valve at the starting air supply to each engine. This is normally part of the automatic valve which opens when an air start is initiated.
In addition to this IACS require that:
For direct reversing main engines >230 mm bore flame arresters or bursting discs are required for each cylinder fitted between the cylinder start air valve and the manifold.
For non-reversing and auxiliary engines >230 mm bore a single flame arrester or bursting disc is acceptable fitted at the supply inlet to the starting air manifold.
Although not part of IACS regulations, a relief valve may be fitted to the manifold where flame arrestors are used instead of bursting discs.
Unsatisfactory practices which have led to explosions in the air start system include:
'Tell tales/drains' at each end of the starting air manifold found to have been blanked off with screwed plugs.
Failure to drain starting air receivers and starting air pipes at regular intervals or before manoeuvring.
Failure to check for leaking air start valves.
Failure to maintain starting air valves and systems strictly in accordance with manufacturers recommended practices.
Failure to maintain fuel valves correctly.
A short circuit is what usually causes a switchboard explosion.
high temperature due to the reciprocating movement of the piston, increase in bearing temperatures, sparks entering the crankcase due to leaky piston rings or piston blow past, fires in the adjacent scavenge trunks. Now, when these hot spots come in contact with the oil in the crankcase, the oil gets vaporised. When these vaporised particles travel to the cooler part of the crankcase they get condensed into a white mist which has oil particles properly dispensed in it. The process that takes place is some what similar to atomization. This white mist when again travels to the hot spot area, can easily catch fire, which might also lead to an explosion. The fire or the explosion create immense pressure inside the crankcase and if this pressure crosses the permissible limit, crankcase explosion takes place. The explosion will rupture the crankcase doors and even cause heavy damage to the inside of the engine.
The Gaseous buildup inside of the internal combustion chamber would cause engine failure, the engine to blow, and explode litterally
4stroke engine are stronger than 2stroke cause you get to break down on a 2 stroke
Incomplete combustion in an engine indicates that all of the fuel has not been burnt. Incomplete combustion can cause clogging and damage to the valves in the engine of a car.
Depending on the force of an explosion, it could kill some of the marine life in the water very close to it. An explosion on a rig also scatters some forms of hazardous debris into the water which pollutes it. Also, an oil rig explosion could also cause a flow of oil or well fluid from a well or pipeline into the water that can cause severe pollution.
May cause engine stop. And if the aircraft is standing still with fire around it, the flames can enter the vent holes for the fuel tanks and cause explosion.
The explosion was heart for many miles. Dynamite can cause an explosion.
why dose a fizzy drink and a mint cause an explosion
Timing needs adjustment is the most likely cause.
my sparkplugs are gaped to wide can that cause my car to surge and poor starting
if you press the pedal to much that is what can cause the engine to flood
A short circuit is what usually causes a switchboard explosion.
Yes, Contrary to popular believe, Cheat-engine can cause death or injury to the person by nuke, arrest, or explosion.
Lightning
Oil spills is the biggest cause of marine pollution. An oil spill can devastate and area of the ocean. Factories are another major cause of marine pollution.
Running too lean.